用C语言编写函数实现美食评分排序（从文本文件中读入数据）以及对美食评分进行统计

好的，以下是用 C 语言编写函数实现美食评分排序（从文本文件中读入数据）以及对美食评分进行统计的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct food {
    char name[20];
    float score;
};

int cmp(const void *a, const void *b) {
    struct food *fa = (struct food *)a;
    struct food *fb = (struct food *)b;
    return (fa->score > fb->score) ? -1 : 1;
}

void sort_and_count_foods_by_score(char *filename) {
    FILE *fp = fopen(filename, "r");
    if (fp == NULL) {
        printf("Error: Failed to open file %s\n", filename);
        return;
    }

    int max_foods = 100;
    struct food *foods = (struct food *)malloc(max_foods * sizeof(struct food));
    int num_foods = 0;

    float min_score = 100.0;
    float max_score = 0.0;
    float total_score = 0.0;
    float avg_score = 0.0;

    char line[50];
    while (fgets(line, 50, fp) != NULL) {
        char *name = strtok(line, ",");
        char *score_str = strtok(NULL, ",");
        float score = atof(score_str);

        struct food f;
        strcpy(f.name, name);
        f.score = score;

        if (score > max_score) {
            max_score = score;
        }
        if (score < min_score) {
            min_score = score;
        }
        total_score += score;

        if (num_foods == max_foods) {
            max_foods *= 2;
            foods = (struct food *)realloc(foods, max_foods * sizeof(struct food));
        }
        foods[num_foods++] = f;
    }

    fclose(fp);

    avg_score = total_score / num_foods;

    qsort(foods, num_foods, sizeof(struct food), cmp);

    printf("Sorted foods by score:\n");
    for (int i = 0; i < num_foods; i++) {
        printf("%s: %.1f\n", foods[i].name, foods[i].score);
    }

    printf("Statistics:\n");
    printf("Number of foods: %d\n", num_foods);
    printf("Minimum score: %.1f\n", min_score);
    printf("Maximum score: %.1f\n", max_score);
    printf("Average score: %.1f\n", avg_score);

    free(foods);
}

int main() {
    sort_and_count_foods_by_score("foods.txt");
    return 0;
}

与上一个示例代码相比，这里增加了对美食评分的统计。具体来说，我们增加了四个变量：`min_score` 表示美食评分的最小值，`max_score` 表示美食评分的最大值，`total_score` 表示美食评分的总和，`avg_score` 表示美食评分的平均值。在读入每个美食时，我们更新这些变量的值。在排序完成后，我们输出这些统计结果。

请注意，这只是一个简单的示例代码，实际应用中还需要考虑各种边界情况和异常处理，比如文件不存在、文件格式错误等。